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Reduced MPG
On my 944 87na the mpg dropped off to 20 and had long crank to start. Turned out to be the Fuel Pressure Regulator was bad.
Took a nut from a fuel rail, drilled and taped with 1/8 pipe threads and installed a fuel pressure gauge at the front of the fuel rail. 28psi when running but dropped to 0 when engine was turned off. Should stay at 14psi for 20 minutes. Replaced the FPR and all is fine. Mileage is back above 20 and starts right away.
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